As for Devin Harris for Diaw, I like it. Humphries is actually a pretty nice player too, so I would be happy with that as well.
As for helping NJ get Melo, I have realized there comes a time you have to stop worrying about other teams and just focus on making your team as good as it can be. If Melo is going to force his way east, we may as well use that as an opportunity to improve. I would hate to see Melo get to NJ without our help if it means we stay stagnant and miss out on potential improvement that we would have gained by facilitating the trade. Even worse if another eastern team was the facilitator and they improved too.
Devin, Jax, Crash,and TT are all either All-Star/near All-Star/or potential All-Star talents.